Data Compression | Sony SDX-1100V/R specification

2.Specification

2.6.Data Compression

The tape capacity is increased by compressing data prior to writing it to the tape. Data compression is a well established technology for reducing the number of bits used to represent data in order to improve data transfer rate as well as reduce the amount of storage space consumed by the data. The compression ratio depends on the source file type. The SDX-1100V uses the ALDC Data Compression algorithm. ALDC is ECMA standard data compression algorithm. (ECMA-222) The Data Compression control page allows the host computer to enable data compression and decompression and also configure the way in which the drive responds to compressed/uncompressed data boundaries on the tape. The AIT-3, AIT-3Ex, AIT-4 and AIT-5 Format allows both compressed and uncompressed data to reside on the same tape.

The Sony SDX-1100V has a DIP switch to disable the Data Compression/ Decompression. After power-on reset with this DIP switch set, both data compression and data decompression are disabled However, a MODE SELECT command can override the setting of this DIP switch. After power-on reset without this DIP switch set, both data compression and data decompression are enabled. (See clause 3.1.4)

2-10	SONY AIT-5 drive SDX-1100V series Ver. 1.0

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Sony SDX-1100V/R manual Data Compression

Contents

SDX-1100V SDX-1100V/R 5.25Model Sony New Zealand Introduction Installation Command Specification 12-1 10-111-1 13-1 Appendix G CD-ROM Device Emulation for Disaster Recovery This page intentionally left blank Introduction About this Product Specification ManualFeatures of the Drive Introducing the Sony AIT Technology Introduction How to get ECMA-329 Standard Document Reference This page intentionally left blank Specifications Specifications Dimensions Mounting Holes 2b SDX-1100V/R Mounting Holes Environmental Specifications WeightConnectors Temperature and Humidity Range Vibration AltitudeSuspended Particulate Shock Performance Specification Data Capacity Load Time Data transfer RateInitialize Time Unload Time Definition of Failure Error RateLong Erase Time Mean Time Between Failures Installation Requirements Power Requirements SafetyConditions of Acceptability Data Compression Installation Installation Guide Scsi ID Number Jumper Termination Power SwitchDIP SW Mode Scsi ID3 ID2 ID1 ID0 Power Connector Parity Disable JumperData Compression on Switch Scsi 68 pin Connector +RST Ground Diffsens Termpwr ReservedGround BSY +BSY ACK +ACK MSG +MSG SEL +SEL Ground BSY ACK GroundGround Termpwr Reserved MSG Ground SEL REQ Attaching and Removing the Dust Cover Attaching the Dust Cover Removing the Dust Cover This page intentionally left blank Summary of LED Indications Tape Motion Cleaning RequestOperation Meaning of each LED indications Replace Tape Inserting Cassettes Operator Action Powering up the DriveHard Reset Hole Removing Cassettes Internal Function Load Sequence Power-Fail or Scsi Reset HandlingUnload Sequence Front Panel Test Diagnostic and Normal Status DisplaysKernel Test Tape Format Tape Motion Cleaning Request Replace TapeTape Alert Normal LED indications Troubleshooting Guide Maintenance, Troubleshooting and Service Head CleaningTape drive will not accept a tape cartridge Tape is in the drive and will not eject Tape guide surface Cartridge Detail a Photo 2 The Initial Position of the Threading Mechanism Clearance for Service Packaging for Return to Sony This page intentionally left blank Overview of the Scsi Interface Scsi InterfaceIntroduction Supported Messages Supported Commands Supported Scsi Commands Command Name Operation Code Scsi Bus Operation Typical Scsi Operation Disconnect Message Descriptions Code Direction Message SpecificationIdentify Parallel Protocol Request Command Complete 00hExtended Message 01h Transfer Period Factor Reserved REQ/ACK Offset Synchronous Data Transfer Request Byte Value Description Synchronous Data Transfer Rates Responding Device Sdtr response Implied Agreement Wide Data Transfer Request Byte Value Save Data Pointer 02h Restore Pointers 03hDisconnect 04h Abort 06h Initiator Detected Error 05hMessage Parity Error 09h Message Reject 07h Ignore Wide Residue 23h BUS Device Reset 0ChIdentify 80h-FFh Ignore Wide Residue Message Byte Value Status Specification Scsi Interface This page intentionally left blank Para Scsi Command OP Code Command SpecificationScsi Commands and Page Index Load /UNLOAD Bit Byte Operation Erase 19hReserved Immed Long Control Evpd Inquiry 12hBit Byte Operation Code 12h Reserved CmdDT Or Operation Code Reserved Allocation Length Control Sony LSB MSB Bit ByteMSB LSB MSB Vital Product Data Length 0Ah Product Serial number in Ascii Identifier length 08h Ieee EUI-64 Code Length 32h Reserved 00h Code set 02h Identifier type 01hLength 08h Product Revision Level Not Available Command support data Hold LOAD/UNLOAD 1BhImmed Reten Load Load Unload Command Parameter Combinations Hold Reten Load Action MSB Locate 2BhLSB Parameter List Length LOG Select 4ChPCR Control field values Value Description Code Description CodesMIC Variable Length Information Parameter Codes Description Reserved Parameter Pointer LOG Sense 4DhBit Byte Operation Code 4Dh Reserved PPC Control field values Value Type of Parameter Values Log Page Descriptor Supported Log Pages Log Parameter Descriptor Lbin TMC 12 Threshold Met criteriaThreshold Met Criteria Write and Read Error Counters Pages 02h or 03h Summary List of Supported Pages 00h Last N Error Events List 07h Tape Alert Log Page 2Eh Tape Alert Log Page Parameter Codes Flag Recommended application client message Probable cause Code Flag Recommended application client message Probably cause Restart the operation Is not mechanically Parameter Code Tape Log Page 30h Sony Unique22 Tape Log Bit Byte Reserved Code 30h Lbin Parameter Length m Parameter Value 24 Tape Capacity Log Bit Byte Code 31h Reserved Length 00 20h when AIT Bit =0 04 00h when AIT bit =1Tape Capacity Log Page 31h Sony Unique 25 Capacity Descriptors Bit Byte Drive Usage Log Page 33h Sony Unique Read and Write Frame Error Counter Page 34h & 35h Parameter Code Length Default Cumulative Default Threshold TSD ETC TMC Lbin Length 58h Data Compression Transfer Log Page 39h Sony Unique34 Data Compression Transfer Log Bit Byte Reserved Code 39h Parameter Code n 35 AIT Log Bit Byte Code 3Ch Reserved AIT Log Page 3Ch Sony UniqueLength n+1 LOG Sense MIC Fixed Length Information Page 3Dh Sony Unique 36 MIC Fixed Length Information Bit Byte ABS AITPrth Ponej MSB Current Amount of Data Written LSB LOG Sense ABS MIC Variable Length Information Page 3Eh Sony Unique LOG Sense Mode SELECT6/10 15h and 55h Mode Select 6 CDB Format Bit Byte Operation Longls Number of Blocks 00 00 00hBlock Length Reserved Block Descriptor Length 08h Density Code Command Sequence Error 40 Sequential-Access Density Codes Code ValueMode Fixed Bit in Read, Write Block Length 41 Mode Select Page Header Bit Byte 42 Supported Mode Select Page Codes Description Disconnect-Reconnect Page 02h Dtdc 44 Autoload Mode field Control Mode Page 0AhAutoload Mode Code 0Ah Length 0Ah Reserved DDE RED Data Compression Control Page 0FhDCE 00h Reserved CAP Device Configuration Page 10h46 Device Configuration Bit Byte REW Mode Select Medium Partitions Parameter Page 11h IDP Psum Mode Select Mrie MSB Timer 00 00 00 00hInformational Exceptions Control Page 1Ch Report Count/Test Flag Number AIT Device Configuration Page 31h Mode Select PCF Mode Sense 6/10 1Ah and 5AhDBD Llbaa DBD 54 Supported Mode Sense Page Codes Description Length 08h Density Code 33h Mode Sense Persistent Reserve in 5Eh Service ActionMSB Generation LSB SCOPE-SPECIFIC Address Reservation descriptorReservation Key Scope Type 61 Persistent Reservation Type Codes 60 Persistent Reservation Scope CodesName Description Code Name Description Bit Byte Operation Code 5Fh Reserved Service Action Scope TypePersistent Reserve OUT 5Fh Parameter List Length 18h Type Service Action SCOPE- Specific Reservation KEY Address Prevent Allow Medium Removal 1Eh Reserved Prevent Control Fixed Read 08hSili Transfer Length Read Read Attribute 8Ch 65 Read Attribute command Bit Byte Operation Code 8ChService Action Reserved Volume Number0 Partition Number0 First Attribute ID Attribute Values service action 66 Read Attribute service action codes Code Name Description Attribute Attribute List service actionAvailable Data n-3 Attribute Identifier MSB LSB Volume Number Partition List service actionVolume List service action First Volume Number Number of Volumes Available Maximum Block Length Limit 80 00 00h Read Block Limits 05h71 Read Block Limits Data Bit Byte Minimum Block Length Limit 00 04h Read Buffer 3Ch Bit Bite Operation Code 3Ch Reserved Mode72 Read Buffer Mode values Description Buffer Offset 74 Buffer ID values Description Offset 73 Read Buffer Header Bit Byte ReservedAvailable Length 75 Read Buffer Descriptor Bit Byte Reserved 76 Echo Buffer descriptor Bit Byte Reserved Ebos MSB Buffer Capacity LSB BOP EOP Read Position 34hTclp Long BPU Block Number 78 Read Position Data Format, long form Bit ByteMPU BPU File Number Supported Page Code 00h Supported Page Code 81h Receive Diagnostic Results 1ChLength 00 02h Length 00 05h Bit Byte Reset Time Reserved Error Set Release 6/10 17h and 57h Parameter List Length Control Invalid Field in CDB 83 Report Density Support header Bit Byte Report Density Support 44hMedia Available Density Support Length MSB Bits PER MM 127 116119 120 128 Service Action Must be 05h Report Device Identifier A3h LUN List Length 00 00 08h Report Luns A0h86 LUN reporting parameter list format Bit Byte LUN List Request Sense 03h Reserved Allocation Length 1Ch Control CLN EOM ILISksv MEW BPV SKSV1SKSV0 90 Sense Key Descriptions Recovered ErrorBytes Description Key Cartridge Fault Append Position ErrorCleaning Failure END-OF-PARTITION / Medium Detected Parameter Value Invalid Saving Parameters not Supported Not Ready to Ready TRANSITION, Medium MAY have Changed Power ON, RESET, or BUS Device Reset OccurredMedium Auxiliary Memory Accesible Command Phase Error Aborted CommandInitiator Detected Error Message Received Volume Overflow 91：Runtime Error Code Diagnostic Failure 92 Reserve 6 CDB format Bit Byte Operation Reserve 6/10 16h and 56hObsolete Reserved Control MSB Rewind 01h Reserved Immed Control Reserved Self Test Send Diagnostic 1Dh95 Diagnostic Page Format Bit Byte Code Reserved UnitOfl Send Diagnostic Service Action06h Reserved Parameter List Length Control SET Device Identifier A4h Count Space 11hReserved Code 99 Space codes ASC/ASCQ EOMSense Key BOT Check Condition 04 01 Logical Unit is Becoming Ready Test Unit Ready 00h3A 00 Medium not Present 04 00 Logical Unit not Ready Write 0Ah Reserved Fixed Partition Number Volume NumberWrite Attribute 8Dh MSB Parameter List Length LSB 103 Write Attribute parameter list format Bit Byte Parameter Datalength n-3 105 Write Buffer Mode Field Reserved Mode Buffer ID104 Write Buffer Mode Field Description Write Buffer 3Bh Write Buffer Reserved WSmk Immed Write Filemarks 10hNumber of Filemarks or Setmarks Power-on Self Test Drive DiagnosticsDiagnostic Test Overview Send Diagnostic command Self Test Send Diagnostic command Individual Test Diagnostic Test Number Summary Sequence Test Receive Diagnostic Result commandError Code Result a Result B Diagnostic Test Number Main Processor Kernel Test Drive Diagnostics This page intentionally left blank Alphabetic Order Appendix a ASC & Ascq Alphabetic OrderASC and Ascq Assignments Byte Description Message Error Logical Unit not READY, Auxiliary Memory not AccessibleMechanical Positioning Error Mode Parameters Changed Appendix B ASC & Ascq Numeric Order Numeric Order Command Sequence Error ASC and Ascq Assignments for AIT drive Sony Unique Appendix C ASC & Ascq for AIT Sony UniqueByte 10-2 Sony AIT-5 drive SDX-1100V series Ver.1.0 Appendix D Scsi Commands Op Code Order SET Device ID Report Device ID Appendix E Medium Auxiliary Memory Attribute Read Write Attribute MAM Attribute states Attribute FormatMAM Attribute Format Bit Byte MAM attribute formats Attribute Identifier ValuesStandard Device Type Attributes MAM attribute identifier range assignments Device Common Attributes Vendor Identification Device VENDOR/SERIAL Number attribute format Bit ByteProduct Serial Number Current Amount of Data Read Medium Usage History attribute format Bit ByteCurrent Amount of Data Written Current Read Retries Count Appendix E Medium Auxiliary Memory Attribute Change Partition Count Partition Usage History attribute format Bit ByteCurrent Write Reties Count Partition Initialize Count Standard Medium Type Attributes 10 Medium Common Attributes Attribute Name #Bytes Format Medium Type Information Standard Host Type AttributesMedium Type 12 Host Common Attributes 13 Text Localisation Identifier Value Meaning 12-12 Sony AIT-5 drive SDX-1100V series Ver.1.0 How to initialize a Worm cartridge Write-Protected WP Bit in Mode Sense DataHow to detect a Worm cartridge Appendix F AIT based Worm system How to handle the Worm cartridge in the drive END Appendix G CD-ROM Device Emulation for Disaster Recovery Read TOC Mode Sense/Select Page Code 0x3CReset Handling Returned Data 20 bytes